/*
 * The contents of this web application are subject to the Mozilla Public License Version 
 * 1.1 (the "License"); you may not use this web application except in compliance with 
 * the License. You may obtain a copy of the License at http://www.mozilla.org/MPL/.
 * 
 * Software distributed under the License is distributed on an "AS IS" basis, 
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License 
 * for the specific language governing rights and limitations under the License.
 * 
 * The Original Code is owned by and the Initial Developer of the Original Code is 
 * Composite A/S (Danish business reg.no. 21744409). All Rights Reserved
 * 
 * Section 11 of the License is EXPRESSLY amended to include a provision stating 
 * that any dispute, including but not limited to disputes related to the enforcement 
 * of the License, to which Composite A/S as owner of the Original Code, as Initial 
 * Developer or in any other role, becomes a part to shall be governed by Danish law 
 * and be initiated before the Copenhagen City Court ("K�benhavns Byret")            
 */

using System;
using System.Collections.Generic;
using System.Linq;
using Composite.Data;
using Composite.Data.Types;
using Composite.Core.Collections.Generic;


namespace Composite.C1Console.Security
{
    /// <summary>    
    /// </summary>
    /// <exclude />
    [System.ComponentModel.EditorBrowsable(System.ComponentModel.EditorBrowsableState.Never)] 
	public static class UserGroupFacade
	{
        private static readonly Hashtable<string, List<Guid>> _cache = new Hashtable<string, List<Guid>>();
        private static readonly object _lock = new object();


        static UserGroupFacade()
        {
            DataEventSystemFacade.SubscribeToStoreChanged<IUser>(OnDataChanged, true);
            DataEventSystemFacade.SubscribeToStoreChanged<IUserGroup>(OnDataChanged, true);
            DataEventSystemFacade.SubscribeToStoreChanged<IUserUserGroupRelation>(OnDataChanged, true);
        }



        /// <exclude />
        public static List<Guid> GetUserGroupIds(string username)
        {
            List<Guid> userGroupIds;

            if (_cache.TryGetValue(username, out userGroupIds) == false)
            {
                IUser user = DataFacade.GetData<IUser>().Where(f => string.Compare(f.Username, username, StringComparison.InvariantCultureIgnoreCase) == 0).Single();

                userGroupIds =
                    (from ur in DataFacade.GetData<IUserUserGroupRelation>()
                     where ur.UserId == user.Id
                     select ur.UserGroupId).ToList();

                lock (_lock)
                {
                    if (_cache.ContainsKey(username) == false)
                    {
                        _cache.Add(username, userGroupIds);
                    }
                }
            }

            return userGroupIds;
        }



        private static void OnDataChanged(object sender, StoreEventArgs storeEventArgs)
        {
            lock (_lock)
            {
                _cache.Clear();
            }
        }
	}
}
